gas, oil, plugs, life jackets, a throwable flotation device, a working horn or whistle, tags, registration, anchor, oars or paddle, bow and stern lights, battery for tm, check all the trailer tie downs, wench strap condition, trailer tires, wheel bearings greased, check bilge pump operation, live well pump, steering cables condition, lower unit oil, water pump impeller condition, condition of carpeting on trailer bunks, check all fuel filters, trim fluid, tow rope, rope for tieing up to dock, depth finder operation, first aid kit, rain gear, tackle, fishing poles, fishing license, spare tire for trailer, check hitch and coupler on the tow vehicle/trailer, brakes on trailer, trailer lights operation, keys, any necessary lake permits, just to name a few things. might need a license depending on which state and insurance documentation. i probably forgot something but I gave it a try. might want to get a service manual on the motor if he wants to perform his own maint and repairs.
don't forget to take off the transom saver when launching the boat - as I did. Don't forget to put the plug in (this is really important) :^).
jd